@Annalee

Exactly!
Because whilst #OpenBSD is propably the safest Operating System that one can hook up to the Internet out-of-the-box, noone's gonna yeet all their #Linux boxes out and force themselves to migrate everything to it.

Just because I know people who earned their living doing #Mailservers on #OpenBSD doesn't mean it's something I'd recommend to anyone even if on paper that's the "most secure option"...

I have had a couple of incidents recently of important customer communications not getting through in part because said customers' SPF records were not correctly set up.

In both cases, the blocked emails were from a mail solution/service that was not listed in the customer's SPF networks/includes – and the SPF record ended with a dash-all (ie: hard fail for others). It boggles my mind that admins aren't setting up these records correctly in 2022.

If you administrate a mailsystem, I urge you to read up on SPF. It is an essential part of your mail domain's validation and reputation and is relatively easy to set up. #SPF #mailservers

https://support.google.com/a/answer/10683907